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1 Introcudion Thefinite differencetime domain (FDTD)methodhasbeenextensivelyusedtosimulatetimedomainelec tromagneticfieldswithinvarious guidedwavestruc tures,andintheopenair[1 ,2 ].Theinformationforthebroadbandfrequencycanbeprovidedinasinglesimula tion .T......